Family: Cell wall with 2 or more partitions.
Subfamily: Cell division occurs at central constriction.
Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977).

Subgenus: Prostaurastrum (lacks arm-like projections)
S. dispar x 640	S. muticum x 640	S. connatum x 640	Staurastrum sp. x 640
Staurastrum sp. x 640	Staurastrum sp. x 640	Staurastrum sp. x 640	Staurastrum sp. x 640
Staurastrum sp. x 640	S. orbiculare x 640
Subgenus: Eustaurastrum (with arm-like projections)
Staurastrum sp. 3 arms, x 640	S. asterias 6 arms, x 640	Staurastrum sp. 7 arms, x 640
S. topopekaligense x 640	Staurastrum sp. x 640
Subgenus: ??? (with arm-like projections)
Staurastrum sp. x 640	Staurastrum sp. x 640